<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        function fun1(){
            alert("点击了")
        }
        function fun2(){
            alert("dianji")
        }
        function fun3(){
            alert("双击")
        }

    </script>
</head>

<body>
    <input type="button" value="按钮" ondblclick="fun3()"  id="">
    
</body>
</html>